Watch a clip from next Monday’s special two-part How I Met Your Mother episode “The Final Page,” in which Barney and Patrice grow even closer…

Someone is proposing – if they think they’re fooling us for a second, they can forget it! It’s totally going to be Barney and Robin… right? Right? Or is it Patrice?! We’ll have to wait until Monday to find out.

SpoilerTV has also released the following sneak peek featuring guest star Seth Green:

In a second sneak peek, Marshall sings us a wonderful song:

To further fuel the BRO-bin fire, check out this interview with Cobie Smulders and Neil Patrick Harris done with EW, in which the pair discuss how long their romantic reunion has been in the making:

Even if we do believe a Barney/Robin engagement is in the works, don’t expect their troubles to be over. CBS has revealed that Pretty Little Liars star Ashley Benson is to guest star in a January episode:

 

TV Line has further revealed that Benson will be playing, “an unconventional love interest” for one of the core members of the group. Hmmm. We can’t help but wonder if this will turn out to be Carly, Barney’s half-sister (don’t forget that Benson’s co-star Lucy Hale previously guest starred as Robin’s sister, so it’d be very fitting!).

How I Met Your Mother‘s two-part episode “The Final Page” airs Monday at 8/7c on CBS! It’s an hour long, so don’t forget to adjust your DVR settings.